RAG+Prompt，AI编程从需求到代码

import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart'; // 假设使用flutter_blue插件

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @overrid
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('智能灯泡控制')),
        body: BluetoothScreen(),
      ),
    );
  }
}

class BluetoothScreen extends StatefulWidget {
  @override
  _BluetoothScreenState createState() => _BluetoothScreenState();
}

class _BluetoothScreenState extends State<BluetoothScreen> {
  StreamSubscription<ScanResult> scanSubscription;
  List<Device> devices = [];

  @override
  void initState() {
    super.initState();
    scanSubscription = FlutterBlue.scanResults.listen((List<ScanResult> results) {
      setState(() {
        devices = results.map((r) => r.device).toList();
      });
    }, onError: (error) {
      print(error);
    });
    FlutterBlue.startScan(timeout: Duration(seconds: 4));
  }

  @override
  void dispose() {
    scanSubscription.cancel();
    super.dispose();
  }

  void pairDevice(Device device) {
    // 实现配对逻辑
    print('Pairing with device: ${device.name}');
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Expanded(
          child: ListView.builder(
            itemCount: devices.length,
            itemBuilder: (context, index) {
              return ListTile(
                title: Text(devices[index].name),
                onTap: () => pairDevice(devices[index]),
              );
            },
          ),
        ),
      ],
    );
  }
}

import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart'; // 假设使用flutter_blue插件

void main
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('智能灯泡控制')),
        body: BluetoothScreen(),
      ),
    );
  }
}

class BluetoothScreen extends StatefulWidget {
  @override
  _BluetoothScreenState createState() => _BluetoothScreenState();
}

class _BluetoothScreenState extends State<BluetoothScreen> {
  StreamSubscription<ScanResult> scanSubscription;
  List<Device> devices = [];
  bool isScanning = false;

  @override
  void initState() {
    super.initState();
    startBluetoothScan();
  }

  void startBluetoothScan() async {
    if (isScanning) return; // 避免重复扫描
    setState(() {
      isScanning = true;
    });

    try {
      scanSubscription = FlutterBlue.scanResults.listen((List<ScanResult> results) {
        setState(() {
          devices = results.map((r) => r.device).toList();
        });
      }, onError: (error) {
        print(error);
        setState(() {
          isScanning = false;
        });
      }, cancelOnError: true);

      await FlutterBlue.startScan(timeout: Duration(seconds: 8)); // 设置扫描超时时间为8秒
    } catch (e) {
      print(e);
      setState(() {
        isScanning = false;
      });
    }
  }

  void stopBluetoothScan() {
    if (scanSubscription != null) {
      scanSubscription.cancel();
      scanSubscription = null;
    }
    FlutterBlue.stopScan();
    setState(() {
      isScanning = false;
    });
  }

  @override
  void dispose() {
    stopBluetoothScan();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Text('扫描状态: ${isScanning ? '正在扫描' : '停止扫描'}'),
        Expanded(
          child: ListView.builder(
            itemCount: devices.length,
            itemBuilder: (context, index) {
              return ListTile(
                title: Text(devices[index].name),
              );
            },
          ),
        ),
        ElevatedButton(
          onPressed: () => startBluetoothScan(),
          child: Text('开始扫描'),
        ),
        ElevatedButton(
          onPressed: stopBluetoothScan,
          child: Text('停止扫描'),
        ),
      ],
    );
  }
}
#优化点说明：
#1. 避免重复扫描：在startBluetoothScan方法中，增加了对isScanning状态的检查，避免在已经扫描的情况下重复启动扫描。

#2. 设置扫描超时时间：在FlutterBlue.startScan方法中设置了8秒的超时时间，避免无限期扫描。

#3. 错误处理：在scanResults.listen的onError回调中增加了错误处理逻辑，并在发生错误时停止扫描。

#4. 手动停止扫描：增加了stopBluetoothScan方法，允许用户手动停止扫描，进一步控制扫描行为。